Included in this reddit post about a cracked racket frame was a comment from m-shafik:
I had a similar crack on my Dunlop Hyperfibre Pro (I hit my opponent’s racket during the follow-through) and my coach used some sort of fiber heat welding (similar to fixing cuts/cracks in fiber car bumpers) and it returned like new. He painted over the welding to make it look original.
Here’s the before photo:
And here’s after:
Wow! Has anyone ever tried that before? I am curious how well that holds up over time.